Novel iridium(III) complexes bearing dimesitylboron groups with nearly 100% phosphorescent quantum yields for highly efficient organic light-emitting diodes

Boao Liu, Feifan Dang, Zhao Feng, Zhuanzhuan Tian, Jiang Zhao, Yong Wu, Xiaolong Yang, Guijiang Zhou, Zhaoxin Wu, Wai Yeung Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

37 Citations (Scopus)

Abstract

A series of cyclometalated iridium(iii) complexes, Ir-B-1, Ir-B-2, Ir-B-3, and Ir-B-4, were synthesized with the 2-phenylpyridine (ppy) type main ligand possessing a dimesitylboron group and the auxiliary ligand containing other main-group element units showing unique charge injection/transporting features. Their thermal stability, photophysical and electrochemical properties, and electroluminescent (EL) performances have been characterized. Time-dependent density functional theory (TD-DFT) calculations were carried out to study the photophysical properties of these complexes. All these complexes can emit intense orange phosphorescence with extremely high quantum yields of nearly 100% measured in neat films at room temperature. Moreover, the solution-processed organic light-emitting devices (OLEDs) using these complexes as orange emitters can show very high EL efficiencies with the maximum luminance efficiency (ηL) of 85.1 cd A-1, corresponding to a power efficiency (ηP) of 69.7 lm W-1and an external quantum efficiency (ηext) of 28.1%.
Original languageEnglish
Pages (from-to)7871-7883
Number of pages13
JournalJournal of Materials Chemistry C
Volume5
Issue number31
DOIs
Publication statusPublished - 1 Jan 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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